Fastening device, medical instrument and instrument system with such a fastening device

Abstract

A fastening device ( 3 ) for detachably fastening a medical instrument ( 2 A- 2 E) to a holding structure ( 1 ) includes two crossbeams ( 4 A, 4 B), two longitudinal beams ( 5 A, 5 B) with a claw ( 6 ) for extending behind a holding surface ( 1 A) of the holding structure. A guide ( 7 - 9 ) is provided, by which the crossbeams ( 4 A, 4 B) are moved in the direction of the claws ( 6 ) of the longitudinal beams during a motion of the longitudinal beams ( 5 A, 5 B) in relation to one another. A clamping structure ( 12 ) is provided for moving the longitudinal beams ( 5 A, 5 B) in relation to one another.

What is claimed is: 
     
       1. A fastening device for detachably fastening a medical instrument on a holding structure with a holding surface, and having two crossbeams, the fastening device comprising:
 two longitudinal beams with at least one claw for extending behind the holding surface of the holding structure; 
 a first guide by which one of the two crossbeams are moved in a direction toward the claws of the longitudinal beams during a motion of the longitudinal beams in relation to one another; 
 a second by which the other of the two crossbeams is moved in a direction toward the claws of the longitudinal beams during a motion of the longitudinal beams in relation to one another, the two crossbeams being on diametrically opposite sides of said two longitudinal beams; and 
 a position changing means for changing the distance between the longitudinal beams in relation to one another including moving the longitudinal beams in relation to one another. 
 
     
     
       2. A fastening device in accordance with  claim 1 , wherein the claws are caused to engage the holding surfaces of holding structure by the motion of the longitudinal beams in relation to one another. 
     
     
       3. A fastening device in accordance with  claim 1 , wherein the guides comprise a surface pair with a wedge surface arrangement formed on said longitudinal beams and a complementary wedge surface arrangement formed on the one crossbeam, wherein wedge surfaces of the wedge surface arrangement and of the complementary wedge surface arrangement that touch each other form an angle with the direction of motion of the longitudinal beams. 
     
     
       4. A fastening device in accordance with  claim 1 , wherein said guides comprise a tongue-and-groove mimic with an oblique projection arranged on one of the longitudinal beams and the one crossbeam, and a recess formed on the other of the longitudinal beam and the one crossbeam, wherein the recess and the projection form an angle with the direction of motion of the longitudinal beams. 
     
     
       5. A fastening device in accordance with  claim 1 , wherein said position changing means comprises a clamping means accessible on a side to move the longitudinal beams in relation to one another. 
     
     
       6. A fastening device in accordance with  claim 1 , further comprising a centering means for positioning the fastening device in the direction of the two crossbeams. 
     
     
       7. A fastening device in accordance with  claim 1 , further comprising a positioning means for positioning said fastening device at the holding structure in the direction of the longitudinal beams. 
     
     
       8. An instrument system comprising:
 a holding structure with a holding surface; 
 a medical instrument to be fastened to the holding structure; and 
 a fastening device comprising two crossbeams, and comprising two longitudinal beams with at least one claw for extending behind the holding surface of the holding structure, a first guide, and a second guide, by which the two crossbeams are moved in a direction toward the claws of the longitudinal beams during a motion of the longitudinal beams in relation to one another and a position changing means for changing the distance between the longitudinal beams in relation to one another including moving the longitudinal beams in relation to one another, said two crossbeams being on diametrically opposite sides of said two longitudinal beams. 
 
     
     
       9. An instrument system in accordance with  claim 8 , wherein the claws are caused to engage the holding surfaces of holding structure by the motion of the longitudinal beams in relation to one another. 
     
     
       10. An instrument system in accordance with  claim 8 , wherein the guides comprise a surface pair with a wedge surface arrangement formed on said longitudinal beams and a complementary wedge surface arrangement formed on the crossbeams, wherein wedge surfaces of the wedge surface arrangement and of the complementary wedge surface arrangement that touch each other form an angle with the direction of motion of the longitudinal beams. 
     
     
       11. An instrument system in accordance with  claim 8 , wherein said guides comprise a tongue-and-groove mimic with an oblique projection arranged on one of the longitudinal beams and one of the crossbeams, and a recess formed on the other of the longitudinal beam and other one of the crossbeams, wherein the recess and the projection form an angle with the direction of motion of the longitudinal beams. 
     
     
       12. An instrument system in accordance with  claim 8 , wherein said position changing means comprises a clamping means accessible on a side to move the longitudinal beams in relation to one another. 
     
     
       13. An instrument system in accordance with  claim 8 , further comprising a centering means for positioning the fastening device in a direction of the crossbeams. 
     
     
       14. An instrument system in accordance with  claim 8 , further comprising a positioning means for positioning said fastening device at the holding structure in the direction of the longitudinal beams. 
     
     
       15. An instrument system in accordance with  claim 8 , further comprising a support frame fastened by said fastening device to said holding structure, said medical instrument being fastened to said support frame. 
     
     
       16. An instrument system according to  claim 15 , wherein said medical instrument has a hook arrangement for fastening to one or more of another medical instrument, to a support frame and to a closing element. 
     
     
       17. An instrument system according to  claim 12 , wherein said medical instrument further comprises a blocking means for blocking said clamping means of said fastening device, by which another medical instrument arranged directly under said medical instrument or a support frame is fastened to said holding structure. 
     
     
       18. A fastening device in accordance with  claim 1 , wherein:
 said position changing means moves said first and second longitudinal beams toward each other in a direction perpendicular to the direction toward said claws; 
 said guides move the crossbeams in the direction toward the claws of the longitudinal beams during motion of the longitudinal beams in the direction perpendicular to the direction toward said claws. 
 
     
     
       19. An instrument system in accordance with  claim 8 , wherein:
 said position changing means moves said first and second longitudinal beams toward each other in a direction perpendicular to the direction toward said claws; 
 said guides move the crossbeams in the direction toward the claws of the longitudinal beams during motion of the longitudinal beams in the direction perpendicular to the direction toward said claws. 
 
     
     
       20. A fastening device for detachably fastening a medical instrument on a holding structure with a holding surface and with a clamping surface arranged on a diametrically opposite sides of said holding structure, the fastening device comprising:
 first and second longitudinal beams, each of said longitudinal beams having a claw adapted to be positioned against the holding surface, each of said longitudinal beams being adapted to extend from said claw and around the holding structure to said clamping surface, 
 a first crossbeam arrangable on the clamping surface side of the holding structure, said crossbeam being connected to said first and second longitudinal beams; 
 a variable connector connected to said first and second longitudinal beams, said variable connector selectively moving said first and second longitudinal beams toward each other in a direction along the clamping surface; 
 a first guide arranged between said crossbeam and said first and second longitudinal beams, said guide forcing said crossbeam toward said claws and against the clamping surface when said variable connector moves said first and second longitudinal beams toward each other in the direction along the clamping surface; 
 a second crossbeam arrangable on the clamping surface side of the holding structure, said another crossbeam also being connected to said first and second longitudinal beams, said crossbeam and said another crossbeam being on diametrically opposite sides of said first and second longitudinal beams; 
 a second guide arranged between said another crossbeam and said first and second longitudinal beams, said another guide forcing said another crossbeam toward said claws and against the clamping surface when said variable connector moves said first and second longitudinal beams toward each other in the direction along the clamping surface. 
 
     
     
       21. A fastening device in accordance with  claim 20 , wherein:
 said guides include sliding surfaces on said crossbeams and said longitudinal beams, said sliding surfaces being arranged to have said sliding surfaces on said longitudinal beams force said sliding surfaces on said crossbeams toward said claws and the holding surface when said variable connector moves said first and second longitudinal beams toward each other. 
 
     
     
       22. A fastening device in accordance with  claim 1 , wherein:
 said guides move said one of the two crossbeams in a direction against said clamping surface during motion of said longitudinal beams toward each another. 
 
     
     
       23. An instrument system in accordance with  claim 8 , wherein:
 said guide move said two crossbeams in a direction against said clamping surface during motion of said longitudinal beams in relation toward each another.